| 摘要 |
PURPOSE:To obtain an elastic tube with unevenly patterned outer surface with good productivity by a method in which a core metal having an uneven pattern on its outside is passed through the cross-head die of an extruder, a liquid rubber or resin is adhered to the periphery of the core metal and hardened, and the elastic tube so formed is turned inside out. CONSTITUTION:A core metal 4 having an uneven pattern 41 of its outside is passed through a cross-head die 1, and a liquid rubber or resin is adhered laminarly to the periphery of the core metal 4. When the material layer 7a is hardened, the layer 7a is removed out of the unit metal core 4a to obtain an elastic tube 7, and the tube 7 is turned inside out in such a way as to cause the corresponding pattern 71 of the uneven pattern 41 of the core metal 4 to appear on the outside of the tube 7. |
